The increasing customers’ demands for the improved
ride comfort, handling and the stability of the vehicle, automotive manufacturers
have concentrated enormous efforts on research and development of the chassis
control systems. In late years, the VSC (vehicle stability control system) and
the drive-by-wire systems, such as steer-by-wire systems and brake-by-wire systems,
have been proposed.

In drive-by-wire systems without any mechanical
backup, the fault, caused by the malfunction of sensors, actuators and
communication systems, endangers the safety of passengers. To cope with the
fault, it is indispensable to develop the fail-safe system in chassis control
system.

The systems, which supply the
information on the occurrence of fault or failure, are called the fault
detection and isolation (FDI) system.

Fig. 1 Drive-by-wire systems

Electrical chassis systems consist of
brake-by-wire systems, steer-by-wire systems, throttle-by-wire systems and etc.
This research will consider a target electric chassis system with subsystems,
such as a brake-by-wire system, a steer-by-wire system and a throttle-by-wire
system.